Seismic survey in progress until further notice by M/V ramform tethys towing 16 9000 meter long cables in…
Norwegian Sea · HYDROLANT 1540/16
What this record establishes
Archived notice · 2016-07-14 22:03Z
This notice comes from the historical archive. Its archived status does not establish when or how the reported situation ended.
- Source and dates
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · NAVAREA I 89/16 192230Z JUN 16.. Issued 2016-06-19 23:07Z. First collected 2026-08-17 13:38Z; last seen in collection 2026-08-17 15:46Z. Collection dates record ingestion, not a new incident or a fresh field observation.
- Location covered
- Norwegian Sea. The map shows an area described by the warning; the listed coordinate is its representative center. Check the original wording for limits and qualifications.
Related notices and cancellation links
Current notices and reporting history in the Norwegian Sea →
- issued
- 2016-06-19 23:07Z
- status
- Archived notice
- authority
- NAVAREA I 89/16 192230Z JUN 16.
- NAVAREA
- NAVAREA I · named as the source of this relay
- sea
- Norwegian Sea
- position
- 63.927, 4.841
- vessel
- M/V RAMFORM TETHYS · 111 messages
- source
- NGA MSI broadcast-warn JSON (archive, frozen 2024-05) · first seen 2026-08-17 13:38Z
Original warning text
NORWEGIAN SEA. NORWAY. DNC 20, DNC 21. 1. SEISMIC SURVEY IN PROGRESS UNTIL FURTHER NOTICE BY M/V RAMFORM TETHYS TOWING 16 9000 METER LONG CABLES IN AREA BOUND BY 64-12.4N 004-14.6E, 64-15.5N 005-20.1E, 63-47.7N 005-26.5E, 63-35.5N 005-01.9E, 63-33.7N 004-25.0E. SIX MILE BERTH REQUESTED. 2. CANCEL HYDROLANT 1177/16.
Reading this warning
- DNC (Digital Nautical Chart)
- A reference to one of the regions of NGA's Digital Nautical Chart, used to tell the reader which charts a warning affects.
- Seismic survey
- A survey that maps the rock beneath the seabed with sound pulses from air guns, recorded on streamers kilometres long.
- Until further notice
- The operation or danger has no scheduled end; the warning stays in force until a later message cancels it.
- Towed array / streamer
- Equipment towed a long way behind a vessel — sonar, a hydrophone cable, a sampling sled — invisible at the surface.
- Tow / towing
- A vessel towing another vessel, a barge or a structure — slow, hard to manoeuvre, and with a long line between.
- Area bound by
- Introduces a list of positions that are the corners of an area — the polygon the warning applies to.
- Position (degrees and minutes)
- How warnings write positions: degrees, a hyphen, then minutes, with N/S and E/W — 49-40.8N 003-43.8W.
- Wide berth requested
- Keep well clear — or, when a distance is given ("TWO MILE BERTH REQUESTED"), at least that far away.
- Cancellation reference
- A line that cancels an earlier warning by its number, such as CANCEL HYDROLANT 1085/12.
- HYDROLANT
- The U.S. long-range warning series for Atlantic waters outside NAVAREA IV, including the eastern Atlantic, the Mediterranean and adjoining seas.
Collected reports in this area · cable & pipeline work
63 within 180 nm since 1999 · 1 in the last 12 months · 0 listed in force now
Counts include repeat notices about the same situation. NGA archive coverage ends 2024-05; live collection began 2026-08-17. The period between them is incomplete. An empty year is not evidence that no hazards occurred.
- Seismic survey in progress by M/V amazon conqueror towing 12 X 10000 metre long cables in area bound by: a:…2026-08-28
- Cable operations 25 jul thru 30 oct by M/V nusantara explorer along trackline joining 52-59.18N 158-50.53E,…2022-07-19
- Seismic survey 130001Z to 141200Z nov by M/V bgp prospector towing 8000 meter long cable in area bound by…2016-11-12
- Cable laying operations in progress until further notice by M/V wg tasman in area bound by 61-08.7N…2016-07-10
- Seismic survey in progress until further notice by M/V ramform titan towing 14 9000 meter long cables in…2016-07-02
- Seismic survey in progress until further notice by M/V ramform titan towing 14 9000 meter long cables in…2016-07-02
Month of issue in the collected archive
All available years combined. Uneven collection and repeat bulletins affect these counts; this chart does not measure the seasonality or probability of incidents.
Nearby notices listed in force · within 120 nm
Worldwide in the collected sources
22 cable & pipeline work listed in force · see all
Record snapshot 2026-09-26 09:23Z; source collection times vary.
Cable ops
Cable laying, pipeline and seismic operations. All current cable & pipeline work →
Not for navigation. This is a re-rendering of an official navigational warning for awareness; mariners must use official NAVAREA broadcasts and their national MSI service.